Method and apparatus for controlling single phase induction moto

Details Method and apparatus for controlling single phase induction moto Method and apparatus for controlling single phase induction moto

1993-08-17

1995-08-29

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

318811, 318561, 318560, H02P 124

Patent

active

054463602

ABSTRACT:
A method and an apparatus for controlling a single phase induction motor. The method comprises the step of calculating an error between an ideal position signal from a reference model and a position signal of the motor detected by a position detecting circuit as the motor is controlled, and the step of converting the error calculated at the previous step into a control coefficient on the basis of an adaptive rule and then controlling the motor according to the control coefficient. The apparatus comprises an AC zero crossing detecting circuit for detecting a crossing point of an AC voltage being applied to the motor, a position detecting circuit for detecting a rotation of the motor, a memory for storing an adaptive rule program based on a speed characteristic of the motor, a microcomputer for calculating a rotation speed of the motor in response to output signals from the AC zero crossing and position detecting circuits and generating a phase angle control signal according to the calculated speed and the adaptive rule program stored in the memory, and a driving circuit for controlling the rotation speed of the motor in response to the phase angle control signal, Therefore, an overshoot at the start of the motor and an error at a steady state thereof can be minimized, resulting in the output of a smooth speed at a transient state.

REFERENCES:
patent: 4713596 (1987-12-01), Bose
patent: 4967134 (1990-10-01), Losic et al.
patent: 4990001 (1991-02-01), Losic et al.
patent: 5013998 (1991-05-01), Varga et al.

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